Smoke-tube superheater.



W. SCHMIDT & P. THOMSEN;

SMOKE TUBE SUPERHEATER. APPLICATION FILED OUT. 3, 1912.

Patented June 3, 1913.

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W. SCHMIDT & P. THOMSEN.

SMOKE TUBE SUPERHBATER.

APPLICATION FILED OCT. 3, 1912.

Patented June 3, 1913.

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WILI-IELM SCHMIDT AND PETER THOMSEN, 0F GASSEL-WILHELMSH6HE, GERMANY,ASSIGNORS TO SCHMIDTSCHE HEISSDAMPF-GESELLSCHAFT M. B. H., 013 CASSEL,

GERMANY.

SMOKE-TUBE SUPERHEATER.

Specification of Letters Patent.

Patented June 3, 1913.

To all whom it may concern:

Be it known that we, WILHELM SCHMIDT and Pn'rnn THOMSEN, subjects of theKing of Prussia, Emperor of Germany, residingat CasselWVilhelmshtihe,Germany, have 1nvented a certain new and useful Improvement inSmoke-Tube Superheaters, of which the following is a specification.

Our invention relates to superheaters n which superheating pipes arepositioned in some or all of the smoke tubes of a boiler which tubes maybe of any convenient d1- ameter. When all the smoke tubes are not usedto contain superheater pipes, such tubes as are so used may or may notbe larger than the remaining tubes.

In superheaters of the above referred to type it has usually beendiflicult, in consequence of the large number of pipe ends belonging tothe superheater elements, to so arrange such ends that they could beeasily and conveniently connected to the steam collectors while at thesame time they and their fastening means would remain accessible andcapable of ready inspection even after installation was complete.

Our invention herein avoids the above difliculty.

It consists, substantially, in so arranging the ends of the superheaterelements of a given row that all the saturated steam-ends are benttoward and connected to a common steam collector positioned to one sideof the smoke tubes involved while all the superheated steam ends aresimilarly bent toward and connected to a second similar steam collectorpositioned at the opposite side of said tubes; furthermore the inletopenings of all said saturated steam ends as well as the dischargeopenings of all said superheated steam ends are arranged in a singlerow.

Our invention is applicable to all kinds of smoke tube boilers.

The exact nature of our invention will be better understood by referringto the accompanying drawingsin which- Figure 1 represents a front view,partly in section of a part of a boiler equipped with one form of theinvention; Fig. 2 represents a section taken along the line 2-2 of Fig.1, Figs. 3 and 4: represent views, corresponding to Figs. 1 and 2, of amodified form of our invention, and Figs. 5 and 6 represent viewscorresponding to Figs. 1

and 2, of still a third modification of our invention.

In Figs. 1 and 2 each smoke tube a contalns four pipe lengths (twoU-shaped loops) arranged in series as one coil to constitute asuperheater element F). A wet steam collector c is arranged at one sideof the row of smoke tubes and a superheated steam collector cl upon theopposite side. The lower ends of each row of superheater elements areeach bent toward and connected to the wet steam collector with theirlnlet openings in one and the same row; similarly the upper ends arebent toward and connected to the superheated steam collector with theirdischarge openings in one and the same row. The two ends belonging tothe two rows of superheater elements, which terminate perpendicularlyover one another are joined to their appropriate steam collectors by aclamping plate 6 and a single bolt 2'.

In the prior art it has been usual to either bend both the saturatedsteam ends and the superheated steam ends of each row of superheaterelements toward the same side of the smoke tubes, or else to bend boththe saturated steam ends and the superheated steam ends of half of eachrow of superheater elements to one side and the ends of the other halfof each row to the opposite side. This arrangement necessarily broughtthe rows of inlet and discharge openings very close together, so thatconnecting said ends to the steam collectors became very difiicult,especially when the smoke tubes employed were of small diameter. 'Withour invention, as above described, this number of rows is reduced onehalf and the vertical distance between adjacent rows correspondinglyincreased. Gonnecting the pipe ends to the steam collectors is thus muchmore easily accomplished while the clamping plates 6 and bolts 2' arevery accessible and readily removable. A further advantage of thisconstruction is that it requires but a single steam collector of simpleprismatic form upon each side of the smoke tubes.

In the form shown in Figs. 3 and 4 each superheater element 6 isconstituted of a single U-shaped loop. As in Figs. 1 and 2, so, here,all the saturated. steam ends are bent toward and connected to a steamcollector on one side of the smoke tubes while all the superheated steamends go similarly to a steam collector on the opposite side.Specifically, the upper ends of the top row of superheater elementsandthe lower .ends of the second row, immediately beneath, are joined tothe wet steam collector while the upper ends of the second row and thelower ends of the third row are joined to the superheated steamcollector and so on alternately. The distance between adjacent rows oftube ends is thus, as to either steam collector, substantially greaterthan that given by the arrangement shown in Figs. 1 and 2. The clampingplates 0 maythus be longer for the same arrangement and size of smoke:tubes and ends, plates and bolts are ren dered more accessible andcapable of inspection.

In the modification shown in Figs. 5 and '6 each superheater element 6consists of two similar coils arranged in series and located in twoadjacent smoke tubes belonging to different rows. A row of superheaterelements in this case, therefore, refers to elements whichare containedin two rows of smoke tubes instead of in one as before. Instead of beingarranged vertically on both sides of'tlie smoke tubes, as shown, thesteam collectors may likewise be arranged hori- ,zontally above'or belowthe smoke tubes.

Having described our invention, we claim:

1. A smoke tube superheater comprising, .in combination, a boilerprovided with parallel rows of smoke tubes, steam collec- -torsonopposite sides of said tubes and para-llel'rowsotsuperheater elements insome of said smoke'tubes all the wet steam ends of each row of saidelements being bent to one of said collectors and all the superheatedsteam ends being bent to the other of said collectors, the openings ofsaid wet steam; ends and of said superheated ends lying respectivelyeach in a single row.

2. A smoke tube superheater comprising, 1n combmation, a boiler providedwith; parallel. rows of smoke tubes, steam collectorson opposite sidesof said tubes and perpendicular to said rows, and parallel rows ofsuperheater elements in some of said smoke tubes all the wet steam endsof each row of said elements being bent to one of said collectors andall-the superheated steam ends being bent to the other of saidcollectors, the openings of said Wet steam ends and of said superheatedends lying respectively each in a single row.

3. In a smoke tube superheater comprising, in combination, a boilerprovided with parallel rows of smoke tubes, and steam collectors onopposite sides of said tubes and perpendicular to said rows, a row ofsuperin combination, .a boiler provided with parallel rows of smoketubes, steam collectors on opposite sides of said tubes and parallelrows of superheater elements in adjacent rows of smoke tubes, all thewet steam ends of eachof saidrowsofrelements being connected in a single:row to one of i' said collectors and all the superheated steam endsbeing similarly connected to the other of said collectors, adjacent rows:of ends belonging 'to adj acent rows 'of elements beingfurtherconnected :in pairs now to one collector and then :to the otheralternately,

.5. A smoke tube superheatercomprising, in combination, a boilerprovided with parallel rows of smoke tubes, steam collectors onoppositesides'of said tubes and ,perpendicular to said rows, andparallel rows of superheater elements in adjacent rows of smoke tubes,.all the wet steam ends of each of said .rows of elements beingconnected in a single row to one of saidcollectors, the ends ofele'mentsbelonging to different rows being also arranged ,in rows, and all thesuperheated steam ends "of the several rows of elements-beingsimilarly-arranged and connected to {the other of said collectors,adjacent rows of tends belonging to adjacent rows of elements'beingfurther connected in-pairsnow to one collector and then to the otheralternately.

In testimony whereof, we have hereunto set our hands in the presence oftwo subscribing witnesses.

WILHELM SCHMIDT. PETER THOMSEN.

WVitnesses:

EGMONT Don'r'rLoFr, JULIUS FRANK.

Gopies of this patentmay beobtainedzfor five cents each, by addressingthe Commissioner of Tatentl, Washington, 13:0.

